[Webkit-unassigned] [Bug 140664] Web Inspector: Make collapsed sidebars undraggable

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=140664

--- Comment #5 from Nikita Vasilyev <nvasilyev at apple.com> ---
Created attachment 246241
  --> https://bugs.webkit.org/attachment.cgi?id=246241&action=review
Animated GIF: Bug with `display:none`

`.sidebar.collapsed {display: none}` introduces a bug, see the attached GIF.

offsetWidth and totalOffsetLeft properties are 0 while resizing:

    _resizerMouseMoved: function(event)
    {
        if (this._side === WebInspector.Sidebar.Sides.Left)
            var newWidth = event.pageX - this._element.totalOffsetLeft;
        else
            var newWidth = this._element.totalOffsetLeft + this._element.offsetWidth - event.pageX;

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